Bulletin of the Bureau of Standards, Vol. 1, 443-447 (1905) Scientific Paper 24 (S24)
If thetas /sub 1/ is the reciprocal of the temperature of a black body, and thetas /sub 2/ that of any other substance at the same photometric brightness, it is shown that thetas /sub 1/ = /b a/ thetas /sub 2/ beta , where /b a/ and beta are constants whose physical interpretation is here given. As the equation is linear, a knowledge of the black-body temperature and true temperature at two points only is sufficient to define completely the departure of the radiation of a given substance from that of a black body throughout the entire temperature scale, provided no chemical change takes place.
Canon EOS 5D Mark II
ABBYY FineReader 8.0
Possible copyright status
The Bulletin of the Bureau of Standards is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder.